Half to william g



` (No Model.)

W. J. FERGUSON,

LUBRIGATOR..

Patented July 16,1895.

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CAQ/Zw UNITED STATES PATENT OFFICE.

WILLIAM J. FERGUSON, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE- HALF TOWILLIAM G. H. STUMP,'OF SAME PLACE.

LUBRICATOR.

lsrnornrcn'rro1t forming part of Letters Patent No. 542,957, dated ,July16,1895. Application led April 11, 1895. Serial No. 545.356. (No model.)

'To all whom t may concern,.-

Be it known that I, WILLIAM J. FERGUSON, a citizen of the United States,residing at Baltimore, in the State of Maryland, have invented certainnew and useful Improvements in Lubricators, of which the following is aspecification.

This invention relates to an improvement in lubricators of that type inwhich a springpressed plunger is employed within thelubricant-receptacle to force the oil or grease therefrom.

The object is to provide a lubricator of the class described havingcertain improved construction of parts, as will be hereinafter describedand set forth in the appended claim.

In the accompanying drawings, illustrating the invention, Figure l is aside elevation of the lubricator. Fig. 2 is a central vertical sectionof the sa'ne. Fig. 3 is a vertical section of the cap 'andspring-pressed plunger as seen when detached. Fig. 4 is a top or planView of the lubricator with the plungerstem above the top incross-section.` Fig. 5 is a bottom view of the outlet screw-plug. Fig.`6 shows two views ofthe valve-locking parts;

In the accompanying drawings, A designates the cylindric cup orreceptacle to contain the grease or oil lubricant, provided at its lowerend with an exteriorly screw-threaded nipple or boss B, through whichextends the outlet-passage b. This boss has a bore c, which extendscrosswise'of the said outletpassage b, and a plug-valve d ts snugly inthe bore and has a port d', and controls the passage of the lubricantthrough the outletpassage. By this construction and arrangement thevalve has three operative positions; iirst, one in which its port d isfully coincident with the outlet-passage b, and said passage is fullopen to its fullest capacity for outflow of the lubricant; second,another in which the port o7. is partially coincident with theoutlet-passage, so as to partially cut off the flow of the lubricant,and, third, another in which the valve-stem is turned so that its port dwill be closed and will entirely cut off the flow of lubricant throughthe outletpassage. A locking device to hold the valve at each of saidthree positions is provided.

The valve-stem has at its free end a rigid arm or projection e, whichhas a slot e', and a plate-spring f is confined by a screw ff and has apointed prong or detent f2, which projects through the said slot e andengages one of three holes g' g2 g3 on a flat extension h on the side ofthe cup, arranged in an arc which is concentric with the axis of saidvalve-stern. Thus when the valve-stem d is turned to either one oftheaforesaid three positions it will be held by thedetent f2 engaging thedesired hole. v

The grease cup or receptacleA is closed at its top by a cap J, thependent flange J of which takes around the exterior side of the cup, andhas an angle-slot j to engage with a pin j on the cup., One or moreofthe slots and pins may be used. Thus the cap is secured, as will bereadily understood. The

cap has'on top a crown-piece or boss lc prov vided with an elongatedopening 7c through 'which the plunger-stemiL extends loosely.

This stem is provided at-its upper end with a suitable handle forconveniencein manipulating the device, and at its lower end the stem issecured to the plunger L. The stem thus moves loosely through the capand may be turned slightly without moving the plunger. The upper portionof the plunger-stem is flat or oval-shaped, as at m, corresponding tothe shape of the opening k in the cap, while the lower portion m isround. Where the oval part and round part join is an annular shoulder n,the function of which will be hereinafter stated. A helicalcompressionspring O surrounds the plunger-stem and bears against theplunger L and forces the latter down. The top end of the spring is heldby an annular rim p on the cap projecting into the spring, and thelowel` end of the spring is seated in a groove q on the top surface ofthe plunger. The face of the plunger is rounded or convex, as at o, tofit close against the concaved bottom o of the grease-cup. Thus theplunger can expel all the grease from the cup.

In order to apply the cap Jand plunger L to the receptacle A it isnecessary to first compress the spring and hold it in a compressedcondition. The spring is rst com'- pressed by forcing the cap down onthe stem IOO ' the plunger yon the grease.y

by first engaging the vertical portion ofy its f angle-slotj with thepin j', and then turning they cap to bring the saidpininto thehori-yzontal part of the slot. This being done the' steminay then ybe given aquartenturn to release the shoulder lm and allow thefstem to moveloosely through the crown-opening 7o. This release of the device whichholds the spring compressed allows the spring to force f the plungerdown upon the lubricant in the cup. By this construction and arrangementof the parts follows the lubricant as the latter feeds out throughoutthe passage b and exerts a oonstant pressure upon the saule as ylong as'any lubricant remains in the cup.

' rlhe'plunger-stem'L has a longitudinal passage r through it for theadmission of air to ytheeup during the time of withdrawing the plunger,andl ai ball-.valve s closes said passage during the time the spring isypressing The ball-valve occupies a socket t ,ini the plunger, which isolosed by a screw-plug u, having an elongated passage 7". The sookethasa valve-seat r2 at the lower end of the passage o, which closes tightwhen the ball-valve s is in position shown in Fig. 2 and entirely closesthe up- The valve cannot, however,

Ward passage r. seat closely on the elongated passage fr', as

'when itis from the cupA, air mayenter ther it will be seen ythat theplunger small openings will 'be left for passage ofair' downward throughsaid passage tothe cup f during the .time rof withdrawing the plunger L.By means of the passage fr and valve s, desired to withdraw the cap andplunger cup and prevent back suction of the'lu'brL f cant, which suctionwould cause the 1u hricant to followr the plunger when withdrawing itfrom the cup.

f It will he understood that when the lubricant is under pressure byaotionof the spring the ball-valve s, by seating on the upper seat r2,prevents the f lubricant from beingforced out through the passager. f

Having thus described my invention, what I claim is`r y y A lubricatorhaving, inr combination, a cup or reoeptaoleopen at top and providedwith an outlet passage; yafcap closing the open ytop of the cup andhaving an opening; a plunger-sterny movable loosely in said opening andhaving any unoccupiedl air passage or round bore extendinglongitudinally; a plunger, L', provided with afsookety into `which thelower end of' therplunger-stem fits; a screw-plug closing the lowerL endof the socket and hav ing an opening; and ay ball-valve occupying thesaid socket and adapted to open and close the said ronndbore in thestern but when seated on ythe, ysaid screw-plug leaving small kopeningsfor downward passage of air tothe cup, substantially as described.

in the presence of two witnesses.

WILLlAM J. FERGUSON. Witnesses:

CHARLES B. MANN, Jr., C. CALVERT HINES.

